Wireless communication system having mobility-based content delivery

ABSTRACT

A portable subscriber access unit includes a wireless transceiver and a processor. The processor controls the transceiver, determines a mobility state of the access unit, and determines a data packet content type. The transceiver transmits the mobility state, receives service rights based on the mobility state, and transmits the data packet on a condition that the content type is allowed by the service rights.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.12/476,377 filed Jun. 2, 2009, which is a continuation of U.S. patentapplication Ser. No. 11/415,003, filed on May 1, 2006, which issued asU.S. Pat. No. 7,542,771 on Jun. 2, 2009, which is a continuation of U.S.patent application Ser. No. 11/119,658, filed on May 2, 2005, whichissued as U.S. Pat. No. 7,039,424 on May 2, 2006, which is acontinuation of U.S. patent application Ser. No. 09/845,241, filed onApr. 30, 2001, which issued as U.S. Pat. No. 6,985,746 on Jan. 10, 2006,the contents of which are hereby incorporated by reference herein.

FIELD OF THE INVENTION

This application is related to wireless communication.

BACKGROUND

Demand for wireless communications equipment and services continues togrow at an unprecedented rate throughout the world. Increasingly, suchsystems are commonly relied upon to provide voice and datacommunications to a growing sector of the public. While these systemsoriginally depended upon analog signaling technology, there isessentially unanimous agreement that future systems will be based onvarious types of digital signal coding schemes.

The typical wireless communication system is a point-to-multipoint typesystem in which a central base station communicates with a number ofremote units located within a local geographic area of coverage known asa cell. This system provides for duplex communication such that signalsmay be sent in both a forward direction (from the base station to theremote unit) as well as in a reverse direction (from the mobile remoteunit back to the base station). In order to support communicationbetween the remote unit and networks such as the Public SwitchedTelephone Network (PSTN), or data networks such as the Internet, thewireless system must also provide for various logical components andfunctional entities.

Consider the Code Division Multiple Access (CDMA) and Time DivisionMultiple Access (TDMA) digital systems presently in widespread use. Eachof these systems provides for certain logical types of the radiochannels that make up the forward link and reverse link. In particular,the forward link channels often include a pilot channel, pagingchannels, and multiple forward traffic channels. The traffic channelsare used to carry the payload data between the base station and themobile unit. A pilot channel is also typically required to allow theremote unit to maintain synchronization with the base station. Thepaging channels provide a mechanism for the base station to inform theremote unit of control information, such as the assignment of forwardtraffic channels to particular connections and/or subscriber units.

Likewise, an access channel is provided in the reverse direction inaddition to reverse traffic channels. The access channels allow theremote units to communicate control information with the base station,such as to send messages indicating the need to allocate or deallocateconnections as required.

Various environmental conditions can affect the performance of anywireless communications system. These elements include atmosphericsignal path loss, which may often introduce fading and interference.Fading may include variations that are introduced as a result of thespecific terrain within the cell, as well as other types of fading, suchas multipath fading, that occurs due to signal reflections from specificfeatures, such as buildings that cause fluctuations in received signalstrength. Systems in which the remote unit may be a mobile unit,especially those potentially operating at higher speeds, such as thecellular telephones used in automobiles, are particularly susceptible tomulti-path fading. In such an environment, the signal pathways arecontinually changing at a rapid rate.

A similar impact on performance can result from movement of thesubscriber units relative to the base station. Motion can make itdifficult for the base station to precisely locate the subscriber unit.In addition, the signal pathways continuously change at a rateproportional to the mobility rate. To maintain a wireless link,additional power and traffic channels may have to be allocated to themoving subscriber. This additional allocation of wireless resourcesremoves resources that would otherwise be available to othersubscribers. This negative impact on other subscribers is more acutelyfelt during rapid movement and when attempting to maintain high datarates across the wireless link.

SUMMARY

Embodiments of the invention reduce the impact of motion and similarphenomenon on the wireless user community as a whole. The system employspricing tiers, which represent each subscriber=s mobility-basedprivileges to specific content. That is, a mobile user can be charged apremium to maintain the same quality of service as a stationary user.The impact of mobility is thus felt by the mobile subscriber, either byexperiencing reduced bandwidth or through higher subscription fees.

A particular embodiment of the invention includes a method of deliveringcontent to a portable wireless device. A wireless communication link isestablished between a portable device and a base station. Thecommunication link can include a Code Division Multiple Access (CDMA)based protocol.

A mobility state of the portable device is then detected. Morespecifically, the mobility state is selected from at least threemobility states, including stationary, pedestrian, and mobile.

Based on the detected mobility state, limited content may be transmittedover the communication link. Each mobility state is associated with atleast one pricing plan from a plurality of available pricing plans. Thiscan include defining, for each pricing plan, a respective set ofdeliverable content types based on the mobility state.

In addition, a representation of the deliverable content types can bedisplayed to a user of the portable wireless transceiver.

Aspects of the invention can be embodied in a computing system foraffecting the transmission of content over a wireless communicationlink. There being a portable wireless transceiver in communication withthe wireless communication link. The portable wireless transceiverincluding an associated level of service and a mobility state. Acomputer program routine operates on the level of service and themobility state to affect the rate of data transmitted over the wirelesscommunication link.

The level of service can be based on a pricing plan associated with theportable wireless transceiver. More particularly, the level of servicecan identify a plurality of allowed content types transmittable over thewireless communication link. Each allowed content type may be identifiedby a respective service port number, a respective protocol identifier,or a respective file type.

The mobility state can be selected from at least three mobility states.In addition, the mobility state can be computed from a metric associatedwith the wireless communication link or from mobility data in theportable wireless transceiver.

The computer program routine can determine a disallowed transmission.The computer program routine can then block transmission of thedisallowed transmission over the wireless communication link.

A more particular communication system includes a wireless base stationtransceiver and a portable wireless transceiver in communication over awireless link. A computer can be coupled to the portable wirelesstransceiver. The portable wireless transceiver can have an associatedpricing plan. Data can be transmitted between the transceivers over thewireless link.

In addition, a mobility processing routine in the base station can storea mobility state for the portable wireless transceiver. The mobilitystate can computed by a processor in the base station. In particular themobility state can be computed from data derived from the performance ofthe wireless communication link or from data provided by the portablewireless transceiver.

A content filter can also be included for blocking data fromtransmission over the wireless link based on the pricing plan and themobility state. The content filter can further block data based on acontent type associated with the data. The content type can representedby a service port number, a message protocol, or a file type.

A gateway can also be disposed between the base station and a wide areanetwork. The gateway can include the content filter.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other objects, features and advantages of the WirelessCommunication System Having Mobility-Based Content Delivery will beapparent from the following more particular description of embodimentsof the invention, as illustrated in the accompanying drawings in whichlike reference characters refer to the same parts throughout thedifferent views. The drawings are not necessarily to scale, emphasisinstead being placed upon illustrating the principles of the invention.

FIG. 1 is a block diagram of a particular communication system suitablefor practicing embodiments of the invention.

FIG. 2A is a block diagram of a particular forward wireless link 240.

FIG. 2B is a block diagram of a particular reverse wireless link 260.

FIG. 3 illustrates an example service rights table of FIG. 1.

FIG. 4 is a block diagram of Internet protocols in the OSI architecturemodel.

FIG. 5 is a schematic diagram of the mobility database of FIG. 1.

FIG. 6 is a flowchart of a particular mobility state processing routine.

FIG. 7 is a flowchart of a particular packet processing routine.

DETAILED DESCRIPTION

FIG. 1 is a block diagram of a particular communication system suitablefor practicing embodiments of the invention. As shown, one or morenetwork servers 2 are in communication with a Wide Area Network (WAN),such as the Internet 5. Each network server 2 typically includes a datastore 3 for storing information content 4. The network servers 2communicate and exchange information with remote clients over thenetwork 5. To that end, the network servers 2 can include a Web serverfor providing Web-based content to an end-user.

The communication system 1 interfaces to the WAN 5 through one or moregateway processors 10. Each gateway 10 typically includes a firewall 11for protecting the communication system 1 from unauthorized packets anda router or switch for directing messages to and from one or more basestations 20. The gateway 10 can also route messages to and from a localnetwork server 2-1 having a content database 3-1 that stores content4-1, and a data server 18 having a database or data warehouse 19 thatstores data such as a service rights database 100 (discussed in detailbelow) and a mobility database 190 (discussed in detail below).

Each base station 20 includes a base station processor 21 controlling awireless transceiver 23 for communicate with a plurality of subscriberaccess units (SAU) 30 over a wireless communications link. Forillustrative purposes, only a single subscriber access unit 30 having awireless communication link 25 is shown. The wireless communicationslink 25 includes a forward link 24 from the base station 20 to thesubscriber access unit 30 and a reverse link 26 from the subscriberaccess unit 30 to the base station 20.

The subscriber access unit 30 is portable and includes a subscriberprocessor 31 for controlling a wireless transceiver 33 for communicatingover the wireless link 25. The subscriber access unit 30 can be incommunication with a computing device 40, such as a laptop computer, adesktop computer, a personal digital assistant, an Internet appliance,or another suitable device. It should be recognized by those of ordinaryskill in the art that the subscriber access unit 30 and computing device40 can be integrated into a single package, such as an Internet-enabledtelephone. It should also be recognized that the subscriber access units30 need not be identical.

The communication system 1 is a demand access, point-to-multipointwireless communication system. That is, the computers 40 can transmitdata to and receive data from the network servers 2, 2-1 throughbidirectional wireless connections implemented over the forward links 24and the reverse links 26. It should be understood that in apoint-to-multipoint multiple access wireless communication system 1 asshown, a given base station 20 typically supports communication with anumber of different subscriber access units 30, in a manner that issimilar to a cellular telephone communication network.

Also, as noted above, the gateway 10 can be in communication with aplurality of base stations 20. It should be recognized by one ofordinary skill in the art that each base station 20 can interface to theWAN 5 through a respective gateway 10. In that case, the plurality ofgateways 10 can employ tunneling protocols to exchange subscriber dataas a subscriber access unit 30 transitions from one base station toanother base station.

In accordance with a particular embodiment of the invention, thewireless communications link 25 adheres to a standard digital wirelessprotocol, such as Code Division Multiple Access (CDMA) based protocols.The techniques described herein can also be applied to other wirelessprotocols, including Time Division Multiple Access (TDMA) basedprotocols. Those of ordinary skill in the art should recognize thatother standard protocols or proprietary protocols may also be used inpracticing the invention.

FIG. 2A is a block diagram of a particular forward wireless link 240. Inaccordance with CDMA technology, the forward link includes a pilotchannel 242, a paging channel 244, and a plurality of forward trafficchannels 246-1, . . . , 246-N. The base station 20 assigns forwardtraffic channels 246 to a subscriber access unit 30 based on quality ofservice parameters. In particular, a subscriber access unit 30 mayrequire an increasing number of forward traffic channels 246 to maintaina desired bit rate.

FIG. 2B is a block diagram of a particular reverse wireless link 260. Inaccordance with CDMA technology, the reverse link includes an accesschannel 262 and a plurality of reverse traffic channels 266-1, . . . ,266-M. As with the forward traffic channels 246, the number of reversetraffic channels 266 may depend on a desired bit rate.

In a CDMA architecture, assigning more channels to a particularsubscriber access unit 30 reduces the resources available to othersubscriber access units. This can degrade the quality of serviceprovided to the other users. One occasion where a subscriber access unitmay request additional traffic channels is in a mobile environment. As asubscriber access unit 30 moves, it becomes harder for the stationarybase station 20 to provide data to the subscriber access unit 30. Thebase station, to compensate, may increase power and assign additionaltraffic channels to the wireless communications link 25. A stationarysubscriber access unit 30, in comparison, may achieve an identical datarate while consuming lower power and fewer traffic channels. It isdesired that the base station 20 not penalize stable or more stationarysubscribers in order to serve one or more mobile units. It should benoted, however, that even stationary subscribers can appear to be mobileto the base station due to various electromagnetic interferences thatmay be local to the stationary subscriber access unit 30 or in the pathof the wireless link 25.

In accordance with embodiments of the invention, a subscriber=s qualityof service can depend on a pricing plan or level. That is, a mobile usercan be charged a premium to maintain the same quality of service as astationary user. In accordance with a particular embodiment of theinvention, three mobility levels are defined: stationary, pedestrian,and mobile. The definitions and technical distinctions between the threemobility levels are an engineering choice based on the particulars ofthe host wireless communications system. Similarly, details on thepricing plan are largely an engineering and marketing choice based onthe technical parameters of the communications system and thedemographics of the customer base.

FIG. 3 illustrates an example service rights table. As shown in thetable 100, there are three columns representing the three definedmobility states 110: stationary, pedestrian, mobile. The rows representthe available pricing plans 120. The table=s data fields identify theservice rights for the subscriber. In a particular embodiment, the datafields are bit maps of the service rights.

In this simplified example, a subscriber can obtain three tiers ofservice in the pedestrian and mobile states: full-service, partialservice, or no service. For example, at pricing plan II, the subscriberreceives full-service while stationary, limited service while operatingat pedestrian levels, and no service when fully mobile. The issue thenbecomes how to divide content across the three mobility states. In aparticular embodiment of the invention, content is provided to thesubscriber access unit in accordance with protocols that adhere to theOpen Systems Interconnect (OSI) model. More particularly, thecommunications system 1 adheres to be TCP/IP standards. The approach toselecting content is thus chosen to follow TCP/IP standards and Internetconventions.

FIG. 4 is a block diagram of Internet protocols in the OSI architecturemodel. As shown, the OSI architecture 50 includes seven protocol layers:a physical layer 51, a data layer 52, a network layer 53, a transportlayer 54, a session layer 55, a presentation layer 56, and anapplication layer 57. Each layer can include a plurality of protocols.In general, content is exchanged between applications at the applicationlayer 57. For transmission to a receiving application, the content isformatted according to a particular application protocol andencapsulated by lower-level protocols. When received at a destination,the lower level protocols are removed to expose the content. To reducethe size of messages transmitted between network computers, the contentis divided into small units and delivered as packets. Across theInternet 5, the packets adhere to the Internet protocol (IP). Inpractice, the gateway 10 can also communicate with the local networkserver 2-1, the data server 18 and the base station using TCP/IPstandards.

Because the impact on other subscribers is most acute when wirelessresources, such as power and channel allocations, are commandeered bysubscribers requesting high data rates over a relatively long period oftime, the services provided can be chosen or excluded in response to therequested bandwidth. In such a case, a wireless metric can be chosen asthe product of power, channels, and saturation of users in theparticular cell. In effect, a subscriber=s mobility can be used toimpact power and channel allocations to that subscriber based on theservice rights table 100.

Such an approach, however, implies knowledge of the payload content inindividual packets. Furthermore, the gateway 10 may need to estimate theimpact of delivering the packet on other subscribers. These tasks arecomplicated by the fact that the packets may arrive out of order. It isusually up to the destination host (i.e., the computer 40) to determinewhether all packets have been received and the final size of the contentpayload. Analyzing this data upstream from the destination host addsadditional, and possibly redundant, processing to the gateway 10.

Another approach is to make delivery choices based on a broader natureof the content, such as file type. It is recognized that certain filetypes may be more demanding of bandwidth than other file types. Forexample, a script generally has very little content—it commands softwarealready on the computer 40 to perform a predefined function. Textcontent may also be less bandwidth intensive, whether the text isprovided as part of a HyperText Markup Language (HTML) file, anelectronic mail message, or a short message. In contrast, streamingaudio and video content can be assumed to be very bandwidth intensive.

Files transported by the File Transfer Protocol (FTP) add additionalcomplexity. First, these files may have an indeterminate size. Second,the files may be compressed by the application program so that theunderlying file type may not be discernible from the packetizedinformation. It is less important to the users, however, that thiscontent be provided quickly. In other words, downloaded data files couldbe passed through to the subscriber using a limited, or slow, data rate.

Because lower level protocols encapsulated higher level protocols, eachprotocol can be identified within a packet. For example, an HTML fileshould adhere to the HyperText Transport Protocol (HTTP) at theapplication layer 170. Similarly, streaming data should adhere to thereal-time streaming protocol (RTSP) at the application layer 170. Byunpacking the received IP packets, the communications system 1 canidentify the underlying application protocol.

Unpacking every packet, although effective, introduces additionalprocessing at the gateway 10 and base station 20 nodes of thecommunications system 1. Fortunately, another broad measure of apacket=s payload content is provided by a service port number, which isgenerally examined by intermediate computers, especially the gateway 10.For example, port 80 generally designates HTTP or browser activity.

In accordance with a particular embodiment of the invention, the gateway10 identifies the content as part of its routing or firewall processing.The gateway 10 is then responsible for determining whether or not todeliver the packet to the subscribers respective base station 20. Tofacilitate this processing, a mobility table 190 is maintained by thegateway 10 and the base stations 20. The database table 190 is stored inthe data warehouse 19 of the data server 18 as a relational databasetable.

FIG. 5 is a schematic diagram of the mobility database 190. Shown arethree fields, a subscriber identification field 192, a pricing planidentifying field 194, and a mobility level identification field 196.For each subscriber, the pricing plan is fixed by a systemsadministrator so that the pricing data identification field 194indicates the subscribers chosen pricing plan, as reflected in theservice rights table 100. The mobility level is, in contrast, dynamic.The base station currently responsible for a particular subscriberperiodically updates the mobility level indication field 196 in themobility database 190 based on the subscriber access unit=s 30 currentmobility state.

FIG. 6 is a flowchart of a particular mobility state processing routine.Detection of a user=s mobility state can be performed by the basestation processor 20. The routine 210 periodically computes a mobilitystate for each subscriber access unit. Each iteration is initiated by atimer interrupt at step 211.

Any suitable technique can be used to determine the mobility state,including mobility detection at the subscriber access unit 30 (such asfrom a mercury switch) and data computed from the reverse access channel262 or reverse traffic channels 266. At step 213, the routine 210measures mobility metrics specific to the applicable methods employed inthe system and the subscriber access unit 30.

From the mobility metrics, the routine computes a mobility state at step215. Again, the computed state may reflect actual motion of thesubscriber access unit or degraded performance due to interference. Atstep 217, the computed mobility state is stored in the subscriber=smobility field of the mobility table 190.

Because the subscriber may not be moving, the routine 210 can forwardmessages to the subscriber access unit 30 at step 219 to indicate thecurrent mobility state and service level. This information can bedisplayed to the subscriber using the computer 40. In particular, anicon 45 (FIG. 1) representing the current mobility state is rendered onthe subscriber=s computer display 42. The subscriber may select the iconto display details of the current level of service.

FIG. 7 is a flowchart of a particular packet processing routine. Eachpacket can be processed by the gateway 10 (FIG. 1) during its firewallprocessing. The packet processing routine 120 begins at step 121, wherethe mobility state of the destination subscriber access unit 30 isdetermined. This is accomplished by accessing the mobility table 190using the subscriber=s identification as a key and then fetching themobility state 196 and pricing plan 194 from the record.

At step 123, the routine 120 looks up the allowed services from theservice rights table 100 based on the fetched pricing plan and themobility state values. The result is an allowed service bitmap.

Once the allowed services are identified, the associated bitmap can beused to filter the content. At step 125, the allowed service bitmap islogically ANDed with the content type from the packet. If the subscriberaccess unit 30 is allowed to receive this content (AND result is 1), thepacket is transmitted over the forward traffic channels to thesubscriber access unit at step 127. If, however, the packet cannot beforwarded to the subscriber access unit 30 (AND result is 0), thegateway 10 performs further processing in response to the disallowedpacket at step 129.

In response to a disallowed packet, the gateway 10 can queue the packetin the data warehouse 19 for possible later delivery to the subscriberaccess unit 30. This would involve additional overhead to store andmanage the queued data packets. Another approach more consistent withInternet conventions is to return an Internet control message to thesource host of the content advising the source to halt further contentdelivery. This can be accomplished using, for example, the destinationunreachable message in the Internet Control Message Protocol (ICMP).Alternatively, an ICMP squelch message can be sent to the source server2, 2-1 to reduce the throughput of the packets to more closely match thewireless bandwidth allocated to the subscriber access unit 30.

Although the packet processing routines 120 has been described as beingprocessed by the gateway 10, the routine may be processed in whole or inpart by the base station processor 20 associated with the subscriberaccess unit 30. In practice, there is an engineering choice betweenoverburdening the gateway 10 and overburdening the data path between thegateway 10 and the base station processor 20. It is expected that theadditional processing in the gateway 10 will not add appreciable latencyto the throughput of the content. This is especially true when each basestation 20 is in communication with a dedicated gateway 10.

The above description of embodiments focuses on the content beingforwarded to the subscriber access unit 30. It appreciated that thesystem can be adapted to also address requests from the subscriberaccess unit 30. That is, the base station 20 can drop requests forcontent that are inconsistent with the subscriber=s current servicelevel as determined from the service rights table 100. For example, amobile level I subscriber cannot, according to the example servicerights table 100, receive or request any content. Any HTTP request fromthe subscriber can therefore be blocked by the base station, withouthaving to wait for the request to be serviced by a server 2, 2-1 andthen blocking the content. Because a subscriber=s mobility state canchange after the request is sent, the content should still beblockable—regardless of the mobility state at the time the request wassent.

A particular embodiment, therefore, verifies reverse-directed packets(away from the SAU 30) as well as forward-directed packets (toward theSAU 30). More particularly, disallowed service port activity is blockedregardless of the message source. This processing can be consolidated inthe gateway 10 and base station 20 nodes.

Limiting forward traffic may be sufficient to maintain an acceptablequality of service for all users. This may be particularly true when thesubscriber is web browsing, which only requires the transmission of ashort Universal Resource Locator (URL) string over the reverse trafficchannels. There are situations, however, when a subscriber attempts totransmit large data files over the reverse traffic channels. An examplewould be an FTP file transfer.

To preserve the reverse traffic channels, at least a portion of thepacket processing routine 120 of FIG. 7 can be replicated on thesubscriber access units 30. Because the service rights are computed atthe base station 20 and transmitted to the subscriber access unit 30 fordisplay to the user, that processing should not be required at thesubscriber access unit 30.

Referring again to FIG. 7, processing at the subscriber access unit 30can begin at step 125. There the allowed service bitmap is logicallyANDed with the content type from the packet. If the subscriber accessunit is allowed to transmit this content (AND result is 1), the packetis transmitted over the reverse traffic channels to the base station atstep 127. If, however, the packet cannot be transmitted (AND result is0), at step 129 the subscriber access unit does not transmit thedisallowed packet.

Those of ordinary skill in the art should recognize that methods forimplementing a Wireless Communication System Having Mobility-BasedContent Delivery may be embodied in a computer program product thatincludes a computer usable medium. For example, such a computer usablemedium can include a readable memory device, such as a solid statememory device, a hard drive device, a CD-ROM, a DVD-ROM, or a computerdiskette, having computer-readable program code segments stored thereon.The computer readable medium can also include a communications ortransmission medium, such as a bus or a communications link, eitheroptical, wired, or wireless, having program code segments carriedthereon as digital or analog data signals.

While the system has been particularly shown and described withreferences to particular embodiments thereof, it will be understood bythose of ordinary skill in the art that various changes in form anddetails may be made therein without departing from the scope of theinvention encompassed by the appended claims. For example, the methodsof the invention can be applied to various environments, and are notlimited to the environment described herein. In particular, thecommunications system 1 is described such that the shared channelresource is a wireless or radio channel. It should be understood,however, that the techniques described herein may be applied to allowshared access to other types of media, such as telephone connections,computer network connections, cable connections, and other physicalmedia to which access is granted on a demand driven basis.

What is claimed is:
 1. A method performed in a wireless transceiver, themethod comprising: detecting a mobility state of the wirelesstransceiver; based on the detected mobility state, limiting transmissionof content over a communication link.
 2. The method of claim 1 whereinthe detecting a mobility state includes detecting that wirelesstransceiver has changed from a stationary state to a mobile state. 3.The method of claim 1 wherein the detecting a mobility state is based onmobility data in the wireless transceiver.
 4. The method of claim 1wherein the limiting transmission of content over a communication linkincludes, determining that a transmission is disallowed and blocking thetransmission.
 5. The method of claim 1 wherein the limiting transmissionof content over a communication link is based on the type of content. 6.The method of claim 5 wherein the content type is text.
 7. The method ofclaim 5 wherein the content type is a data communication.
 8. The methodof claim 5 wherein the content type is a voice communication.
 9. Themethod of claim 5 wherein the content type is an electronic mailmessage.
 10. The method of claim 5 wherein the content type is a shortmessage.
 11. The method of claim 1 further comprising displaying thecurrent mobility state to a user.
 12. The method of claim 4 furthercomprising: notifying the source of the content that the transmissionwas blocked to prevent subsequent transmissions.
 13. A subscriber accessunit comprising: a processor configured to detect a mobility state ofthe subscriber unit; the processor further configured to, based on thedetected mobility state, limit transmission of content over acommunication link.
 14. The subscriber access unit of claim 13 whereinthe processor is configured to detect the mobility stated based on achange from a stationary state to a mobile state.
 15. The subscriberaccess unit of claim 13 wherein processor is configured to detect themobility state is based on mobility data in the wireless transceiver.16. The subscriber access unit of claim 13 wherein limiting transmissionof content over a communication link includes, determining that atransmission is disallowed and blocking the transmission.
 17. Thesubscriber access unit of claim 13 wherein the processor is configuredto limit transmission of content over a communication link based on thetype of content.
 18. The subscriber access unit of claim 17 wherein thecontent type is text.
 19. The subscriber access unit of claim 17 whereinthe content type is a data communication.
 20. The subscriber access unitof claim 17 wherein the content type is a voice communication.
 21. Thesubscriber access unit of claim 17 wherein the content type is anelectronic mail message.
 22. The subscriber access unit of claim 17wherein the content type is a short message.
 23. The subscriber accessunit of claim 13 further comprising a graphical user interfaceconfigured to display an indication of the current mobility state to auser.
 24. The subscriber access unit of claim 13 wherein the processoris further configured to notify the source of the content that thetransmission was blocked to prevent subsequent transmissions.
 25. Thesubscriber access unit of claim 13 further comprising: a computer incommunication with the subscriber access unit, wherein the transmissionsof content from the computer is limited based on the mobility state ofthe subscriber access unit.